<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root">

    </div>
</body>
<script src="../react.js"></script>
<script src="../react-dom.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
<script type="text/babel">
    class App extends React.Component{
        inputRef=React.createRef();
        state={

        }
        render(){
            return (
                <div>
                    <input type="text" ref={this.inputRef} defaultValue="123123123"/>
                    <button onClick={()=>{
                        console.log(this.inputRef.current)
                        // 获取输入框内容
                        console.log(this.inputRef.current.value)
                    }}>获取输入框内容</button>
                </div>
            )
        }
    }

    ReactDOM.render(<App/>,document.getElementById("root"))
</script>
</html>